Hi there

A few weeks ago I had an ulcer which got significantly worse throughout the subsequent weeks which I have never previously had before..Last week I felt very confused generally and a bit unsteady on my feet but generally ok aside from that. I also had a bad cold/flu which my dad also had so did not think too much of it at the time. Within the last few days I have begun to get even more confused, having problems with my vision, I have noticed that my taste buds at the back of my toungue are more pronounced than usual and i have a white substance on my tongue and I had a bit of irritation down below and swollen neck glands. I have also just started me period but the flow keeps stopping and starting and my blood is pinker than usual. I have also been experiencing tingling sensations in my hands. I have never had unprotected sex but I have had oral sex before and one of my partners cheated on me with a very very rough girl who sleeps around with druggy types and he also seemed very reluctant to go for a STD test.
The doctors have anticipated that I have Hyperthyroidism which could explain the sudden weight loss, swollen neck, feeling exhausted, weak legs and the irregular period.
Do you think I have concern to suspect having a STD?