Hello, i was taking Wellbutrin Xl 300mg for 2 yrs. the last 6 months i was taking a generic brand. However, i became very depressed i the last 2 months. i was hospilized 3 weeks ago. They took me off of Wellbutrin and now i take Celexa and Remeron. However, i dont like their side effects. So today i switched back to Wellbutrin. Can i do this? i took it around 9:20am this morning, then 20 min later i began to feel lightheaded and my heart was racing. Is this normal?