What helps?

22M)So since the last 2 years i have been through a lot of traumatic things which involved the passing of a lot o loved ones,relationship,work stress etc etc.
All this has led me to develop extreme anxiety and insomnia among other stuff. That stomach drop feeling you get when coming down from heights well i sorta have that but at all times like something bad is always about to happen and any minute everything will come crashing down. Sometimes i wanna just have a complete breakdown and cry my heart out but don't because that would just make my family worried and that would just worry me more. Occasionally i have flashbacks of those traumatic incidents and just get stuck there. Every now and then i have panic attacks where my breathing gets a little heavy. Feels like i haven't slept in ages plus all the stress eating has made me gain weight when i'v never been chubby or overweight in my entire life. 
I just don't know what to do or how to calm down so i can get even a moment of peace....