Man I know how you feel, I've had similar experiences but not as full on as yours. Thankfully I was never in an environment that provoked the experience on as you were, which sounds like half the problem. You need to look at this seemingly fucked up experience as a chance to grow, heal and evolve. You've been on a trip to your darker side and that ain't ever easy. You'll most likely be more aware of the darker aspects of your being from now, but thats not a bad thing it helps us to realise our true divine nature. Its all on the road to healing and realising ourselves.
Mushrooms have bought this forth for you rather brutally and so having been so traumatic it might take a while to feel you are ballanced again, to the more positive side of life but you will be fine. When you're going through a rough patch like this you need to show some extra self compassion and be easy on your self. Look for the things in your life that you are grateful for however small they may be and know that although life can seem so dark there are always things you can be grateful for. Do this every day and it will help to realise that you have plently of things to live for. Exercise like running can be a good start to help pump some of those good old endorphins through and keep you grounded. Also care for your body by feeding it good food and lots of water helps alot. I highly suggest getting into some form of physical yoga too which will help to regain ballance and wellbeing and help purify the sunconscious. Find a good Dvd and do it often it helps alot.
However the best advise I could give you is to learn to be with these painful feelings/emotions that go along with those bad thoughts. These are feelings that like a small child, need your recognition. When these emotions that feel so freaking bad come up we tend to drive them away or not feel them at all costs. We instead bury them in our subconscious mind where they unconsciously affect our lives, crying out from afar to be simply felt. All emotions are a bodily message that need to be recieved by us. Seriously this is the best way to heal your emotions that I have found. Simply feel them! Feel them and listen to them and be wioth them in your body. Get in touch with those feelings and be with the feeling. It takes a little practice but the key is to be gentle and simply allow the feelings to be in your body. Don't rush the feeling or try to intensify it just leave a certian space and feel what it has to say and where it takes you. Name the feelings as they arise, eg."fucked up shitty feeling in my chest" In this way the emotional energy is finally recieved and ultimately transformed and we are healed. This is a quick simplistic explaination. Mental insight comes along the way, you regain true peace and happiness. Let me know if you want to no more about this type of work.
I believe shrooms have the power to show to us our true divine nature, revealing to us our deep connection to the eternal light of god and all that is. Buddha nature, christ conciousness. On the other end of the spectrum they can drop us deep into the darkness of our subconscious minds. We all have this darker side of our subconsious, where we hide all our emotional hurts and fear from over our lifetime (and perhaps lifetimes before). People live their whole lives subconsiously in the pursuit of keeping this darkness at bay, though never fully aware of it. Others might decide to do some mushies and next thing you know you've been tossed into the dark seas. Its a rough old place the darkness, one of fear and seperation from the light of source but through bringing its contents into the light, we are healed.
%u201CThere is no coming to consciousness without pain. People will do anything, no matter how absurd, in order to avoid facing their own Soul. One does not become enlightened by imagining figures of light, but by making the darkness conscious.%u201D