high anxiety is back, stoned, almost passing out feeling

I am not sure what to do.....have had this for years and it went away....now I am a director and my position has me under alot of pressure,plus having 3 teens and working 11 hour days...no pressure....I have stopped at lights while driving and suddenly feel like i am stoned,gripping onto the steering wheel and shaking my head to come back worried i will let go of the brake.I have been in meetings and feel like i am losing control of all body functions or I am going to pass out.....its really scary and its happening hourly now.....the stress is ridiculous right now in this job,and more stress is put on waiting for the next moment i feel these out of body moments.I drive an hour to work and hour home.....I have alot of fear of just"going out '.....I cannot even remember what i had prior to calm down....I am joining a gym to settle my mind but know i need to at least somehow get time to go to a walk in with some kind of solution....anyone know what could help calm?deal with the reality,get back to "earth"...because I dont know how much longer I can do this....