If you choose to go back for Computer Science, I would like to strongly suggest you are always keeping in mind "How am I going to get a job." I don't say this because it is necessarily hard to get a job as a Software Engineer, but rather that many undergraduates ignore their GPA and internships and just assume they will get a job when they graduate. Doing well in your classes and leaving your professors with a favorable impression of you also helps during the job hunt.
Also, make sure you are attending an accredited university with credits that can transfer to other universities. Not that you need to worry about transferring, but make sure you are attending a quality institution with a degree employers will take seriously (e.g. not ITT). Keep in mind that you don't need to pay an arm and a leg for such a degree either.
Finally, on a somewhat unrelated note, have you talked to a doctor about anti-anxiety medication? I know several people who had anxiety problems that manifested as a nervous stomach. They are on anti-anxiety meds now and doing fantastic. I am absolutely not a doctor and this may not be relevant to you, but just thought I'd bring it up.