What Is The Treatment For Insomnia Due To Wellbutrin And Should I Be Worried About Missing Periods After Taking It?

I ve been taking 300 mg Wellbutrin XL for about 4 months after trying Celexa and Effixir and having terrible side effects with each of them. I ve felt good on the Wellbutrin except since I started my periods have stopped and I have terrible insomnia. I can only sleep for about 30 to 45 mins before waking up. I ve tried both Seroquel and Trazodone at night but I found neither really improved my sleep much and I had a drug hangover that lasted most of the next day. I was on extremely low doses of each. I ve since switched to Wellbutrin SR in hopes that I will sleep better. I take 150 mg at 5 am and 150 mg at 1 pm. I still am not sleeping any better. Any suggestions? (And should I be worried about missing my periods? btw I am not pregnant!)