For The Last 2 Months I Have Had The Following

for the last 2 months I have had the following symptoms
I would call them "attacks" for lack of a better word
my left leg below the knee starts getting warm and a lot of pain is experienced especially when sitting down the pain is traveling down to my ankle and now to my big toe. The last episode I had I didn't have any felling on my toe. I already had a vascular test done and no blood clots were found. Blood clots were suspected because I have varicose veins in that leg I also have to mention I have advance RA I claim to know how RA pain feels like and I know this is different
Should a vascular issue be dismissed? Could this be also arthritis related? Could this be something new, ie. a nervous system issue?
I should also mention that when I have an "attacks" I also experience nausea and dizziness