Flexeril and mg 3

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.

Rx for 10mg Flexeril 6/19/08 for severe muscle spasms upper back and neck. Took one tablet 6/19 2pm, one tablet 6/19 10pm. Slept well, but woke up with spasms worse than ever. Took 2 10mg tablets 6/20 7am and slept ALL day - 16 hours in a 24 hour period. This is day 5, 10 mg 3 times a day. It has greatly decreased the muscle spasms, but makes me feel spacey and out of it. Today my wiccan goddess friend asked me if I was stoned - she said my eyes looked funny and my energy "felt chaotic". I didn't tell her I was on Flexeril. Makes me wonder: do I appear more "altered" to others than I feel inside myself? That's bad, because if I have less control than I realize, I probably shouldn't be -- well, driving, for one thing. For five days I had an odd sense of well-being - today I feel agitated. My heart has been racing all day, which it hasn't done before.