They do relieve pressure on the back. If you like your current pillow top mattress, you could go with one that is a memory foam mattress at it's core with a pillow top cover over it. Very comfortable. See the link below for the one I own. Very comfortable.
Yes
the best would be a pillow top if you want confort
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The truthful answers is: "It's the thickness you are willing to pay for". One manufacturer I know of makes memory foam mattresses in three configurations: The top 2" of the mattress is memory foam, the top 4" is memory foam, and the whole mattress is memory foam. The price varies accordingly. Personal Note: If you can't afford a memory foam mattress, try a memory foam pillow. Awesome, especially if you're a "side sleeper".
The Spinal Pillow is the best. It aligns the spine, eases lower back pain. Placing this specially designed pillow between the legs relieves sciatica pain and scoliosis caused by pelvic instability.
Depends on who you ask. Manufacturers and retailers tell you no, but memory foam does off gas which can cause headaches, sinus problems, etc
The quality of pillow top mattress depends on what materials are used in the pillowtop layer. Eg, assuming that the springs and coils are of the same quality, then we will look at what are used in the top layer. Generally, high quality latex foams and memory foams are better than purfoam
Pillow tops are already a form of mattress pad, so you shouldn't need an additional one on top of it. However, consider getting a thin mattress pad to balance out your weight across the bed.
A mattress cover will work well, but may not give as even coverage as a real, integrated mattress pillow top.
I noticed a pillow top Eastman House mattress at Mattress Warehouse in Germantown, MD.
It really depends on the mattress and the sheets, but my guess would be no.
Single pillow top mattress has one layer of cushioning layer. Double pillow top mattress has two cushioning layers. Sometimes you can buy removable pillow top layers which are simple to put on and off.