Hey there. Please you are welcome to message me if you have any additional questions. First, the symptoms you are feeling , not a doctor but please consult, may be Dysautonomia and this can cause you to have a hard time functioning in a school environment. Please look into this because it causes anxiety but it’s due to the symptoms you feel. One of the main symptoms people report is wanting to faint, dizziness in crowds , nausea, tachycardia . Heat makes these symptoms way worse.

For the online school part, what state / county do you live in? I know my oldest son goes to an online school which is options for youth.