Am I in serious trouble?

I had bariatric surgery about 10 months ago and lost over 160 pounds and was told that tailbone pain can be common. it feels like a m since I have never felt my tailbone before as I have been fat my whole life. my question is this, is the tailbone supposed to move? when I feel it (as it hurts at night from sleeping on it (my back) it feels like a m and it moves freely. I also just recently had surgery (last week) for gall bladder issues and cannot aford to take much more time off from work. is this moving a sign of colon cancer or retum cancer, is it a tumor? if this is not life threatening than I can deal with it a while so I can build up time in work to see a doctor but I need to know. should my tailbone move so freely and if so is that ok? is it a cyst? if so, how serious is that? please help, I am so sick of these health issues.