Started Taking Wellbutrin XL About 3 Weeks Ago For Anxiety

started taking Wellbutrin XL about 3 weeks ago for anxiety and it has worked well for the anxiety, but was causing me headaches. Also, i was already having trouble sleeping at night, but my insomnia seemed to get worse with the Wellbutrin. My neurologist prescribed me Amityptilene to help with the headaches and insomnia. This is only my third night on it and I have an awful headache(they normally aren't this bad). I'm afraid to stop taking the medication, but at the same time I'm not sure if I should take the amitryptilene. I was prescibed 10mg, but I have been cutting them in half to see how I would respond first. Any suggestions?