Something i feel in my calf and painful.

Hi doctor, i am facing this type of problem last 1.6 years ago..when i have a slip disc pain and pain go to my leg....then i am on bed rest for 3 months and in my right side of leg there is some clot appear..but doing masage and daily activity pain and clot go automatically and i don't feel anything now again am on home and less activity the clot type of thinga appear agin...i go to some urget work and drive my car around 3 hours after 9 months after 3 day clot and my right calf painful..but todaybis around 10days clot aize is less but its painfull whwn i will put pressure in that...there is no color change but i touch and fell aomething inside the calf...and i have a work of aily sitting around 4-5 hour then i wake and again sit...but now i change my habit ...can somebody pleaae guide me what is the issue ..is it dangerous ...