This is mostly an opinion based question on your life is it not? easiest way to deal with any of these problems is just force yourself to be happy.
Histamin is associated with the answer of the body to allergy factors, gastrin and secretin are out of the question.
Answer:
You may have had an allergic reaction. Keratosis Pilaris is also a skin condition that can cause red bumps on the skin, but they usually just itch, and they don't hurt. If you have been under a lot of stress, it may be a stress rash, or maybe even a heat rash, but usually they just itch, although stress rashes usually occur in the form of hives, which can burn/tingle. If you notice anything very serious, or if the problem continues for an extended period of time/doesn't go away, you may want to contact your doctor or schedule an appointment with a dermatologist to make sure it isn't anything serious.
