"I slept one night on this mattress and pillow, that caused me the worst back pain. Fortunately I could return them. "
It would be very difficult to imagine that one night on a mattress would cause back problems.
They obviously honored the warranty and you returned the mattress, so what's your beef?
"I looked for the original manufacturer, the expensive one, and tried it in the store. I only lied on the pillow for a few minutes. That caused me extreme neck pain. I want to go to a doctor, but I want to know, if the costs might be covered ..."
Let's see, you went into a store tried out the mattress and want to sue for extreme neck pain.
Surely, you don't expect anyone to take you seriously.
What medical doctor has possibly tied in some serious injury to either of these experiences???
Forget about suing anyone for either 1 night on a mattress whcih caused 'severe back pain', or a few minutes on a mattress in a store, causing 'severe neck pain. If you suffer such pain, it is likely a pre-existing condition.
You fill these boards with your irrational scenarios with an underlying desire to sue someone/anyone, and I see you're back again. One can only wonder if you are presenting hypothetical rather than real issues, considering the proliferation of complaints that seem bizarre.
You appear to be the unluckiest person in the universe, considering the litany of posts ready to sue someone/anyone.
And you have certainly been advised to 'consult an attorney' enough times on these boards to have acquired an education on the law as regards the tenets of litigation--including the requirement that you must prove injury (usually serious in nature).