Well firstly you need to visit your dentist asap, before the condition detiorate further . Moreover your symptoms are pointing towards poor periodontal health of your teeth . Which can be treated by scaling ( claiming of teeth) and if it is advanced it can still be corrected seeing your Age. Good that you have quit smoking , good both for your general as well as dental health.
Next Steps
please visit your dentist for final diagnosis of the problem.
Health Tips
brush twice and rinse after every meal .
warm saline rinses( keep some warm water with little salt in your mouth for a while and then spit, take a sip or two again and do the same) will help to some extent,,but gold standard still remains " visit your dentist "