i can very well understand your present oral conditions, after eighteen extraction and set of new dentures .
now since you have taken a very good decision of having a set of dentures, then you must be little patient to follow the following things too.
healing is a natural process it takes time to form new blood vessels collagen
fibre and nerves. we cannot interfere in this but yes, we can enhance healing by just maintaining few simple steps. this will not only relief pain but also improves your oral condition .
1 take very healthy nutritious diet in semisolid or liquid state only, without putting undue pressure on new dentures and hence on gums.
2 strictly maintain good oral hygiene
in your healing gums as well as at the base of denture.
3 always store dentures in water , separately brush them and wash with mild antiseptic solution.
your gums with your index finger slowly, this improves blood circulation.
5 presently wear your dentures only when required
6 stop smoking
and alcohol consumption if you have any habit.
7 get accustomed to new dentures slowly
8 presently for your immediate relief do warm saline rinses without dentures and take
tab combiflame every six hourly for three to five days.
i am very sure , very soon you will be using your set of dentures comfortably and painlessly