Wellbutrin and cramps

Day 21 on Welbutrin XL 150 mg. - prescribed to help stop (light) smoking habit & for depression. I loved it - smoking urges not nearly as strong, more energy, very few emotional outbursts & general sense of calm, happiness & well-being. I haven't felt this good for 4 years. Have tried other meds in past but quit due to weight gain & sexual side-effects. Yesterday I developed HIVES. Damn. Saw nurse practitioner today. She wants me to switch to Lexapro. Told me to start w/ 1/2 a tab @ bedtime tonight. AAaaarrrgh! Anyone have any experience w/ Lexapro?

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.

IVE BEEN ON WELLBUTRIN XL 300MILAGRAMS AND IM ON THE THIRD WEEK NOW. I STARTED THE FIRST WEEK WITH THE 150 MILAGRAMS. WELL NOW FOR THE PAST 2 DAYS I HAVE BEEN EXPERIANCING DIZZINESS AND CRAMPS IN MY STOMACH MAY BE CAUSE IM ABOUT TO HAVE MY MENISTATION OR IT MAY BE THE MEDICINE..JUST NEED TO KNOW IF THIS IS A POSSIBLE SIDE AFFECT AND IF IT WILL GO AWAY.