Oh honey, you poor things I wish I could just give you a great big cuddle. If your worried and think you can't call your dr maybe try MotherSafe its a free phone service that is usually run by nurses, they should be able to tell you if you are in any trouble. I am like you though, I am paranoid about being around anyone who even sneezes near me. I wont go and visit my MIL in hospital after her hip replacement because I could catch something nasty from the hospital air conditioning.
Take a big deep breath and know that even though some things can pass through to bubby, most of the time they are oblivious to our aliments. Please cheer up... your pregnant at least and half way there. In just 4 months or less you will be holding your sweet little bundle of cuddles and all this will be a past memory. Try and think of the positives and don't let any stress steal this experience from you, cause you deserve it!
P.S. Go and book yourself a foot massage or reflexology and zone out for a bit.