Neck pain and stiffness symptoms and conditions

Hey all. I started on Bactrim for pneumonia yesterday, which brings me up to 4 doses as of today. After the first pill I noticed my lips were turning red and felt like burning and hurt quite a bit, but I had no idea it was from this med. After the second dose, I noticed a pounding headache and neck pain and stiffness starting. It feels like my head is just going to explode when I cough now. After dose 4 my tongue is swollen with a burning feeling also. So I started to catch on and looked it up online only to find several websites full of people who have had similar, and many other, side effects. Needless to say, I will never take Bactrim EVER AGAIN! I'd rather deal with the pneumonia!! Now my concern is how long will it be before these side effects go away? I've heard some scary stuff about permanent effects! :-/

Prescribed Flexeril 10 mg/3 times a day for back and neck pain and stiffness. I had no relief with one tablet, so yesterday I took 2 tablets at noon, then another tablet before bed. Today my muscles are looser, but I have a strange tingling and numbness sensation on my left side. It's affecting the left side of my upper and lower lip and face, left shoulder, left arm and fingers and left leg. It's not painful but I am a bit scared. The pill should only last 4-5 hours and it's now been 10 hours since that last bedtime dose. So why am I still feeling this effect and when will it go away? And I am supposed to take 3 a day for a month?! I am not sure if I will be taking anymore.