WHAT THE HELL?! Whatever happened to Amoxicillan? A simple UTI ...

WHAT THE HELL?! Whatever happened to Amoxicillan? A simple UTI and I'm a complete freakazoid. Nightmares, short of breath - sighing all the time. I thought I was just getting stressed. Hand tremors. Muscle behind my knee just plain hurt but I thought I pulled something working out. I took it for 9 out of the 14 days prescribed but when I had a complete emotional meltdown over something stupid - I decided to stop. I'm still short of breath and my lungs hurt and it feels like I have a lump in my throat. More than anything I'm pissed.