I had surgery for ruptured bicep in January. they could not repair all the way back to shoulder and anchored it to pictorial muscle. now i have spasms through out the day and when i do any thing to flex bicep i get sharp pain and bicep stays flexed for a long period of time. muscle relaxers help a little with the spasms but not the pain or flexing when i use it. Botox has been recommended but worried about side effects and it will even work?