Hackers

Hi my name isMarian Stath, I need help with my Facebook and messenger account. Someone stolen my phone number and gmail address using it to get into my Facebook account. Each time I tried to recover my gmail, I was sent a message saying server not responding. I got myself an iPhone with new email, and hackers using my personal info to log in. They freeze my privacy and security settings so that I can't change either phone numbers or some anomalies occur eg frequently asked to use certain passwords. My question is, How do I download Facebook and messenger safely? My phone gets extremely hot each time I try. Please help. I've changed passwords a million times that now I have a note book beside me to keep track. This is ridiculous. I can't connect with my family and friends.
Thank you
Marian