I'm not a doctor but can't imagine there's a link between your abnormal cells and swellings under your arms. I think the key thing is that none of us on this site is a doctor, and if you're worried about swellings and your period the best thing would be to speak to your GP. Getting medical advice from a qualifed health prfessional is always the best thing to do with any health worries, and much better than googling or having things go round in your head without getting it checked.
Generally, for most ladies, abnormal cells don't have symptoms (hence smear tests).
Try not to dwell too much on what's happening (easier said than done I know) and to keep yourself busy/distracted. Also if you can try not google either, and if you to stick to decent sites like this one.
All the best.