ladyboy fun but now living in hell. 17 week neg but overwhelming symptoms

So here we go. 6 months ago I went to Thailand on a stag doo. I ended up really drunk and having sex with a ladyboy from what I remember it was just masturbation and her being denied access to my arse. 6 days later I had a fever and was told o had a viral infection which o disregarded as a common one. I then had sex with my fiancee and she developed a purpuric rash shortly afterwards.. I googled this and it said it's a sign of viral Infection. I managed to stay calm bit did worry. Then on came the red rash fever and headaches plus nausea. She had this for a week to ten days I had a test them at 4 weeks and was clear and thought it was over. Them I got a rash and swollen nodes on .my pits. Panic again had us both tested me at 8 weeks her at 7.2 weeks. Were told were fine and to enjoy outlr lives but it continued my fiancee got a reoccurrence of sciatica which wouldn't cease and I gained weight and both of our oral health as noticeably declined. I also have a lot of twitching and have noticed my stool has blood on ot. I I decided I can't do anything until diagnosed so I holidayed in Greece as planned and on return to UK got tested at 17 weeks post exposure to receive a negative results again although perplexing symptoms. I have asked many doctors and experts on forums who advise me to seek mental help not physical any ideas or opinions?