My Journey To RA and Methotrexate, but Now.... Teeth?

Eighteen months ago I seized up overnight. I was 65 years old. No one had RA in my family. My GP didn't know what was going on. My blood test showed 65 on inflammation scale. My right knee ballooned but it was painless. GP took "goo" out thinking I had gout. The blood tests showed serum negative. Then the Orthopaedist thought I had tendonitis and after 2 weeks of hell my GP put me on 8 x2.5g of methotrexate. It all started to settle. The side effects, other than ulcers, are loss of teeth. Ive lost 5 in 18 months. I have no other mouth disease at all. There are no rheumatologists in the Eastern Cape South Africa which is a nightmare. My mouth is a crime scene. We reduced methotrexate to 6x 2.5 a week. Still a mess. After 18 months my GP suggested I stop altogether to give my mouth a break. Now after 6 weeks of no methotrexate I have very mild stiffness in my left hand when waking up. Any idea what's going on?