Its been just under 8 months since I weaned DD off EBM. My milk dried up rather fast, with out any signs of mastitis etc.

Is it possible that I could have mastitis? I've got a few large red hot marks on my right breast around the nipple and just above and I've been headachey, tired, nauseated etc. but no sore joints yet. I haven't been able to get any more milk since about 5 months ago! (I used to get drops every now and then if I hand expressed in the shower)

What can I do to prevent it from getting worse if it is mastitis?