HELLO!
Don't let them intimidate you. This is what your landlord will be doing IF you get your ducks in a row. Get your psychiatrist, or therapist to write a letter for you showing what your pet has done for you since you have had it, + how you were before you had it. Make sure that everything you do is in writing to your landlord, + by certified mail, with return receipt requested, so they can't ever say they didn't get it.

Do a google search for disabilities and pets, + do your research so this can NEVER happen to you again. I did this, + I'm ready to take on the world now, + I have 3 cats, + an iguana. I have everything I need now to fight it in court, IF I ever need to. I suffer from depression myself, so I KNOW how it is.

No, they are not supposed to raise your rent, since your pet is supposed to be an assistance animal. Get that letter!

Also go to the hud.gov site, + also do the same search as above. I did, + I have tons of articles, to use as precident, including case law.

Also go to:
livejustice.custhelp.com
dlc-ma.org
ada.gov
bazalon.org

May God bless your efforts. Get started!
stines