Do you think that you were exposed to the virus in someway? Please be specific.
1. Diabetes can not interfere with your body's mechanism of reacting to this alien matter, there is nothing but being on chemo for cancer that would cause delayed sero-conversion leading to abnormal antibody production.
2. Sero-conversion doesn't take place after 6 months post infection even in the most broken immune system response, if your body was so compromised you were not going to be here typing on MedHelp today, you'd been probably on some big Med support to stay live. No way!
3. You have conclusively tested negative and do not need any further testing. Please work towards acceptance of your result, if you are unable to do it, see a professional. You don't have HIV.