How do i cope(what else to do)?

i have seen a psychiatrist and psychologist and have been diagonised with social anxiety .i am currently on anti-depressantsand i also practice deep muscle relaxation techniques and breathing exercises.i have got abit better but i have a problem with my 'fight or flight reflex'.i feel like i cannot cope anymore.when i walk in quiet streets or places and a car just appears suddenly or a person looks at me i jerk,almost running away,move really quickly(sort of an adrenaline surge).i don't have much of a problem with crowded places as i just blend in.when i am walking in hallways and someone appears the same happens.when people enter rooms that i am in(when they get me unaware) i jump and feel like running away.it is an automatic response and it has become part of me.i have been signed off work as i was always been kicked out of jobs and everyone thlnks that i am an idiot.i just cannot control it and people are always gossiping and i have become a laughing stock.what do i do?