Any remaining financial aid will be refunded to you. Generally, if financial aid has disbursed into your student account and a credit is created, you can expect to receive a refund within five to seven business days.
Tobacco contains nicotine. Some people are very sensible to toxic effects. Dizziness and nausea are toxic effects of nicotine. Chewing tobacco with result in mouth and throat cancer. Hope you are smart enough to realize you must stop.
The dizziness is often caused by overbreathing, or not breathing the correct way. Too much oxgen will make you dizzy, so you can counteract it a bit by breathing into a paper bag, or learning to breathe from your abdomen. Have a search for some breathing excersises and see if that helps.