Fever blister symptoms and conditions

oh yeah on my previous post I forgot to mention that I did have a fever blister break out worse than usual but it went away with my prescription. ( I get them a lot so it is prescribed to me)

I've had symptoms for about two months now without knowing they were coming from taking doxy. First, I couldn't sleep at night b/c my feet felt like they were on fire! and my hands had the same tingly feeling esp. after a change in temperature. Then my toes became red and swolen around the nail. After about a month, the feelings never really went away but always got worse when I was in the sun. A rash began to develop on the tops of my toes. Each bump looked like a tiny water blister. After more sunlight, the rash spread to my hands and arms. More fire. I also got the terrible feeling in my thumbs and index fingers that felt like I banged them with a hammer. Now that the rash is going away (still bad on my toes), my fingernails are terribly brittle, discolored, and are coming off the nail bed on a few fingers. I've also gotten a fever blister and terrible sunburn on my nose, ugh. I was presecribed this medicine for acne, but that seems as though it hasn't even been treated. I've also noticed blurred vision and back pain, but I think that is just b/c I hate my job. LOL.

recurring fever blister and/or canker sore on lip (same place each time); right hand weak-sometimes difficult to hold pen to write and difficult to open jars; right eye "flickers"