Anxiety can manifest itself in a variety of forms. Oftentimes, medical diagnoses mimic psychological symptoms. Given that you have several symptoms: dizziness, tingling, and heat flashes, I recommend that you receive a physical examination by a qualified doctor to rule out organicity. While your symptoms may be characteristic of anxiety, you are also beginning to become skeptical of others intentions about poisoning your food, etc. I think confronting logically your irrational fears are helpful as your poisoning concern is improving by your report. As mentioned, medical conditions could be the cause of your symptoms and/or a psychiatric condition.
Begin with a thorough physical examination and when conditions that could be causing your symptoms are ruled out, then you can receive a psychological evaluation to determine your exact diagnosis and preferred treatment.