How to deal with Wellbutrin headaches?

I'm brand new to this forum. I primarily post on the ulcerative colitis forum, but I'm hoping that some of you can offer some advice on this topic.

I have a couple of pretty serious health problems which cause severe fatigue and GI symptoms, so it's been really tricky to find an antidepressant that works without making me more sick and exhausted. Wellbutrin seemed to do the trick, but 150 XL was giving me headaches daily. I switched from extended release to regular pills and my doctor lowered my dose with the idea of raising it gradually to see what I can tolerate. I just bumped up to 113 mg (1.5 75 mg pills, cut in half, taken 3 times a day at 4 hour intervals) and the headaches have started again.

It's taken me two years to find a drug that works at all and I really don't want to stop taking it.

Does anyone have any tips for when or how I could take it in the hopes of cutting down on these headaches?

I'm taking them as prescribed by my doc. He switched me from XL to the other kind before I started cutting them in half.
This dose is definitely less effective for controlling my depression than 150 mg, but I can still feel it a little bit.

As for the headaches, it's normally one temple or the lower back of my head. At the higher dose of Wellbutrin, they lasted for days and progressed to migraines. At this dose, it progresses from mild to moderate throughout the day, and is worst in the evenings. I don't get them every day, but I'd say about 50% of the time. Sometimes tylenol helps, sometimes it doesn't. I don't take NSAIDs for the obvious reason.

Yeah, it's a very common side effect. The number 1 reason people stop taking it, according to my doctor. I just don't want to quit unless I absolutely have to.

I take it at 6 am, 10 am, and 2 pm.