i have have moderate anxiety and my friend gave me one of his buspar (bar with 3 10's on the back with M B4 on the front) split it in half and took it. 10 minutes later i just didnt feel good at all. Felt like i was going to pass out constantly, was out of breath, and my heart was pumping pretty good. also had these twitches where my whole body would just slightly jerk at once and each time that happened i felt like i was going to pass out. I did the exact same thing the next 2 days and the same thing happened. i find myself basically waiting for the drug to wear off because i'm afraid of what would happen if i passed out. Am I having a allergic reaction to this medicine, or just experiencing bad side effects?