I just now signed up with Common Dreams so that I could respond to your comment this morning. For years I have refrained from commenting online because our government is no longer a democracy and now spies on its citizens. But your pain truly touches me and I have liked your previous comments consistently, so I will break my silence for you.
First, I (like millions of others) share your deep pain this morning over Bernie Sanders losing the Democratic nomination for the Presidency (so far) to the very corrupt Hillary Clinton after a year of dirty tricks and corruption by the Democratic Party (national, state, and county), and by the corrupt corporate media and their corrupt talking heads. You (and all of us) have a right to mourn for as long as you need to. The stakes are very high for all people (and all living things) in the U.S., in every nation, and for life on Earth. This U.S. election matters very much. So, yes, your feelings matter and deserve respect.
Second, since you asked for others' help, please let me humbly offer my current thoughts. (I don't know all the answers either.):
1) Care deeply, but try your best to not care too much. I truly respect that each of us is unique and some of us have more sensitive, emotional biology and psychology. But given who you are (and who each of us is), try to balance caring with calmness. Try to maintain a longterm, philosophical perspective.
2) Most immediately, do positive behaviors to help comfort and console yourself. Take a break from politics and the news. Take a nap. Take lots of deep breaths. Go outside and enjoy the soothing beauty of nature. Take a walk or a bike ride in the park. Go see the ocean and walk along the waves and smell the salt sea air. (If you can't go to the ocean then listen to a tape or a CD of the sound of the waves.) Listen to music that either gets you to dance out your pain and anger energetically or evokes your sorrows and tears. (Crying releases your pain and brings relief). Then listen to music that soothes and comforts you, and then listen to music that inspires and uplifts your spirit. Read your favorite poetry or short stories or novels. You get the idea. Actively do the things that will help you heal your hurt right now and build your health and happiness again.
3) As for your friends' and family's politics, I have learned that most other people do not change their political views, even when presented with many facts and proven examples. I have learned to just accept (and try to respect) others in my life who have political beliefs that I am very disappointed in. Again, try to cultivate a philosophical attitude and your own equanimity and peace of mind. Try to accept (and love) your friends and family as they are, and try to focus on enjoying the values and goals you have in common with them. Life is short and they or we can die at any moment. So fully enjoy the time we share with family and friends.
4) As for political activism, if and when you want to (and are physically and emotionally strong enough), consider contacting the politically active groups whose values and goals you share most in common with. Either locally or online, there are many people with whom you can share moral support and acts of political activism to advance your and their political goals. (Personally, I'm joining the Green Party today. The Democratic Party left me long before I am leaving it!) But please pace yourself. Try not to overwork, over-emote, or over-stress yourself, emotionally or physically. Again, try to develop a longterm perspective and a philosophical attitude. You (and each of us) will "win some and lose some." And "this too shall pass." Again, it's important, right, and good to care deeply about things that truly matter. But again, try not to care too much, which can be harmful to your health, life, and relationships.
5) Lastly, whatever happens at the Democratic convention or in the national election this year, dear ol' Bernie Sanders (bless his soul!) has worked so very hard and has accomplished so very much for our nation and our world. The movement (that Occupy Wall Street was and is a part of) will continue. The common people are awakening (continuously and increasingly) -- and the terrible conditions of our lives in the U.S., in other nations, and on our beloved Earth will guarantee that this movement for democracy, equality, justice, and humaneness WILL continue. But I want to caution (and cushion) your hopes: please try to take comfort and satisfaction in simply caring and doing the best you can. We may not get all (or any) of what we strive for. But in our efforts and in our movement we can take satisfaction and (if need be) consolation.
Wishing you much healing and peace.