Nutcracker

Hi all, I would be really grateful if someone can help me with this issue. I went to us legally about 20 years ago but failed to fulfil the requirements of my visa. I got married to a US citizen but was deported and banned for 10 years. I went back to my home country and after few years of my wife trying to get me back to USA, we gave up. My wife initially wanted to get a divorce but then for some reason she did not follow through so we stayed married. I on the other hand got married in my home country (India) and subsequently moved to UK and had kids. My Indian wife and I got divorced few years ago and am single now. My USA citizen wife contacted me out of the blue and told me she had cancer and was undergoing treatment. Now my question is if I can apply for a non-immigrant visa to go see her at least or in the best case scenario get an immigrant visa based on our valid marriage. We had applied for I-601 when I was in the US but do not know what happened to it. I am looking forward to your replies which will be much appreciated.