All meds react differently w/ different people's symptoms. But, yes, what you describe as your reaction to some of the muscle relaxers is a common one. Sometimes, those "side effects" pass; other times they don't.
Many of the benzos may have "relaxant" qualities.... but I haven't personally had them used as a true muscle relaxant. Typically, they are used for anxiety related symptoms. And benzos can bring on a whole set of side effects of themselves (just my opinion).
Several popular muscle relaxers are: flexeril, zanaflex, soma, skelaxin, robaxin and so forth. It all depends on what your doctor feels is best for your conditions.... And, to repeat, they can all work differently for people. I have a huge tolerance to meds... but if I take flexeril, it knocks me into bed. I take soma (carisoprodol) and it works well for my muscle spasms, w/ little side effects.
Let me know if you have any other questions, or didn't understand something I wrote :)
Good luck! --Tina
Dx: Disabled due to many, many health/pain issues
Meds: Heart meds, Effexor, various Pain Meds (I've literally been on them all)...and on the list goes; intrathecal pain pump candidate
Personal: Christian wife and mom; I have six sons...and two "surprise" blessings - identical twin daughters (born 9/2010)