It won't hurt to call to see if you can get in earlier - alot of people get nervous and cancel their apts (I do... which is not a good thing..) When you get like that it's pretty hard to control - but you understand what is happen to you - so that's good in a way. It gives you a bit of control. Right now I'm falling apart - so I guess I'm not the best one to be giving advise... But I do think you should call your pdoc and let him know that you are in urgent need to see him before you sch apt...It cant hurt anything.
Keep posting so we know how your doing. Best of luck! {{HUG}}