Things that come up during tapping are called aspects. They may seem unrelated but most of the time there is a relationship. Tap on every thought that comes up.
food allergies are related to a single incident of a separation conflict from the foods. If you can recall the original event, tap on it... it should ease or eliminate the allergies.
Seemingly going backwards is often a symptom of healing. When I work with patients (I even work with experienced EFT's) a lot of conflicts are overcome. This causes minor harmless edemas within the brain which will cause a few days of disorientation, usually no more than 3 to 5 days.