Wellbutrin and palpitations

I've been on welbutrin sr for 8 years. and it has been a miracle drug for me. I have bi-polar disorder, so am limited in terms of types of anti-depressants. Last week I went to have my prescription refilled, and the pharmacy told me it was back-ordered. They suggested I try welbutrin xl, same dosage, but once a day instead of twice a day. My doctor approved it, and I took it for 4 days. I couldn't leave the house, my anxiety was so bad. I couldn't stay awake in the afternoon, and couldn't sleep at night. I had a constant headache, and palpitations. I'm convinced that if I had remained on it, I was headed for a manic episode; the first in 8 years. So I called the drugstore, and they procured my old prescription for me. Anyone else have this kind of experience?

I've been taking Wellbutrin SR in increasing doses for the past three months for depression. At 100 mg twice daily, I had headaches and stomach aches for the first few days. I was bumped up to 150 mg twice daily and the headaches and cramps returned briefly. I'm now taking 200 mg twice daily. I've been having palpitations nightly since increasing to 400 mg dose -- especially when I lie down in bed. I'm also having twitching, occasional tremors, gas pains amd heart burn. These are not symptoms I experienced before I started taking the medication. On the flip side, this medication has worked remarkable well on my depression, My feelings of doom, hopelessness and general disinterest in life have faded with every increase in dosage.

none that i can think of. got rid of the depression and i take it with adderalxr which i moddified the dosing of so it is smoother.
I split the adderal capsels so i can take it over a couple of hours in three doses with a small dose later so i do not get agitated later.
This takes care of any palpitations or speed feeling during the day to as it does not go into my system all at once twice a day as the two sets of beads dissolve.

I know this is just welbutrin but i take both
add and depression