I was diagnosed with PTSD four years ago. I have such a big problem trying to fall asleep and it can take hours for me to feel tired which affects my mood the following day. Also staying asleep is a massive problem due to the night terrors. I have tried everything from Kalms, chamomile tea, scented oils, breathing exercises, sleep meditation etc. So I went to the doctors recently to say I had finally given up with not being able to sleep. She increased my sertraline to 100mg a day.. Will this help? Or am I just wasting my time?