No one helping me with my health issues and bullying me about it - please help me!!

I've been struggling with an illness which came out of nowhere and has seriously affected my life. It has been SUPER HARD to diagnose and we have no idea what is wrong, but after lots of trials, we have finally found a medication that has been able to help reduce a little bit of my symptoms and make me a bit more comfortable. Other than suffering through so much pain and hardship, some of my family members keep saying that it's 'all stress' and I 'need to relax' when I'm literally not stressed at all, and they keep saying that 'its in my head' which it is clearly not and that I need 'self-control' because there's nothing wrong with me and I'm just crazy. It's really upsetting me because I thought these people loved me and I'm just really ANGRY, AND SICK AND TIRED OF EVERYONE. Like I've just had it and I was not stressed before, but honestly all these horrible and nasty unhelpful comments from people who are not bothered to help me and want to brush aside my pain are really just not helping me. I am really sick and tired of everyone and everything and I have to live with and see these people everyday, and they keep trying to catch me out in 'lying' about my symptoms by tricking me when there's literally nothing I am making up. It's so upsetting and I don't know what to do. Because I am being treated by the NHS, the NHS is so overworked, they are also not really bothered about helping me and some lazy doctors are just saying to relax. Please help me, everyone is so horrible to me, how do I deal with them and help myself, I know for a fact this is not in my head and I am sick and tired of dealing with everyone. Sorry for the long rant, I just really really need some help and someone to talk to.