Need some advice on Amitrytyline dosage. Wondering if it's best to take it all at night or split it up during the day? What has worked for others using this drug?

A little history. I've been taking Amitriptyline for about 3 months now. Started at 10mg at night for the first couple of which didn't do much for my daily headaches. Then, went to 20mg at night which was effective for two or three weeks. Later up to 30mg, taking 15mg at night and 15mg during the day. Using a pill cutter with the 10mg tabs to whip up this combination. Still having headaches but not as frequent and pretty much limited to later in the day after work stress and or prolonged computer use. So on my last visit to the Nuero this week after mentioning I that I still get occasional headaches, he bumped me up to 50mg(2 25mg tabs). He tells me I can take it all at night or in the morning or split it again. My decision?? I feel like he's just throwing more of this drug at me at this point just to get me out of his office faster. Three days now taking 25mg at night and 25mg during the day and I haven't been sleeping good. This higher dose at night is making me restless and my mouth very dry(maybe causing the restlessness??) Unsure of how to proceed.

BTW, trying to spell "Amitriptyline" alone is something that gives me headache.

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7 months PCS. Headaches, tinnitus, anxiety, depression, easily aggravated, frustration. Did this to myself. One too many bourbon shots. Did a face plant on the side walk. Sustained concussions from this(embarassed) before, but first time getting PCS. Been alcohol-free since this happened, found Jesus, and have done a personal and spiritual 180.