Can I sue a mattress company for rejecting a claim due to a stain?

Yes but it would probably cost more than you would recover.

What will most likely happen to me?

It will likely settle for the policy limits. If not, you may need to consult your own defense attorney.

Is there any recourse to reaching out to the mistresses family or friends through facebook (or email) to share the story?

This sounds like a recipe for disaster. Forget about her and move on.

Do i have any liability claims against said landlord or is it entirely to late . could mold exsposure cause such condition.

First see if your doctor thinks you have any condition that was caused or aggravated by the mold.

Can I sue the hospital or doctor

Gather your records and get them reviewed.

What can I do to resolve this?

Consult a personal injury attorney as soon as possible.

You have a small comp case. I would consult an attorney just to make sure your dental bills get paid. Good Luck

My questions are do I have means for compensation , Do I need a second opinion, from another orthopedic surgeon...

Ask your attorney. It sounds like you have a claim in there but your attorney is much more familiar with the facts.

Are lawyers entitled to one third of your Medical set aside money

Read your agreement with your attorney. You might want to save yourself the hassle and just ask your attorney if they intend to take a fee on the MSA.

Workers comp settlement as income for child support.

Consult a family law attorney to be sure but if you are current I do not see why you would have to pay more unless the agreement/order is modified.