hello guys i have been on mertazapine for years now i started of with 15 and now on 45mg for my PTSD and depression i currwntly have been down and not been sleeping as there not knocking me sleep so docs have perscribed me zip 3.7mg im abit wary of doing this has any of you guys took these together and what was the outcome i also take tramadol aswell during the day because of my back conditions