Autism

Are there any Side Effects that go along with HBOT?

Yes, there are a few but the great benefits often out weight the side effects in most cases.
Ear and Sinus pain or discomfort from the change of pressure, this can be minimized by ventilating or (popping) the ears well during pressurization, or by slowing your dive speed/ descend a little until you are comfortable. (common)
Temporary Drowsiness (common)
Temporary Hyperactivity (common)
Temporary Dizziness (rare)
Temporary Vision changes (rare)
Temporary Headache or nausea (Can be caused by die off or enhanced detoxification) (rare)
Temporary Regression (Can be caused by die off or enhanced detoxification) (rare)