I just got prescribed this two days ago for my night terrors caused by PTSD. Morning one had horrible headache but it was tolerable cause no nightmares took Tylenol n headache mellowed out. Morning two still no night terrors but worse headache light hurts birds chirping hurts and my eyes are almost swollen shut. Feels like I am using all my energy to try n open them. So is this common? Will it keep getting worse or mellow out?