Welcome to HCM
I went through your history & would like to tell you that post extraction there is pain & swelling, difficulty in swallowing in some cases & its nothing to worry about.Healing requires time & there is formation of granulation tissue that appears whitish in color. Later on it merges with normal gingiva
Still if you feel that something is inside then you should get an IOPA done of associated region.
Meanwhile you can do warm saline rinses.
You also mentioned that you are experiencing burning sensation in tongue & that might be due to side-effects of antibiotic that you might be taking.I would suggest you to take some multi-vitamin therapy
for that & avoid spicy food.Consult your dentist
for further problem.