Medication.
Withdrawal of benzo's and morphine causes anxiety and in the sensitive panic. Usually less than 24 hours, but it can be nasty. This includes codeine in T3s and what ever hydromorphone is. It is because the opiates cause a dopamine spike and the withdrawal is a dopamine craving. This is different than the Benzoes that put neurotransmitters to sleep and when they come back on line you get information over load. (agitation)
Antibiotics cause toxins. increased activity causes increased neurotransmitter activity. The increased activity is foreign and causes anxiety that can lead to panic. Benzo's help but you will get withdrawal from the Benzo, But it will be one day only instead of the ten to fourteen days you are on the antibiotic. Not all antibiotics cause anxiety.
Calcium can do some of the work of Serotonin but can not be taken within two hours of antibiotics. Calcium helps move neurons along.
Because 95% of Serotonin is in the body, you can get physical symptoms when starting SSRIs. They pass.
Davit