By the sounds of it, your father prefers your brother to you. This thing about your brother acting gay around you when you're round your fathers house could be to impress you parent. Have you got a good relationship with your mother?

It sounds like your father and brother are no good to you and even thou you are family, you may need to cut them off if they are causing stress and wellbeing illnesses. Sometimes you have to be cruel to be kind and this sounds like a good example of what that saying means.

You need to remove yourself from the situation, so move on. She if you can move in with a friend or someone who cares about you where your brother or father can not access you. One day your brother will change, and when that happens he will come and find you. You should be thinking of your own wellbeing before anyone else

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