I'm glad to hear that you are getting better. Let us know if you need any additional assistance.
Thank you for your feedback. By the way, the tongue coating on my tongue has reduces by a significant amount after 3days.
Not by licking your nipples, no.
A lot of the times the mind can play a mean trick on you, in the way of making you believe you have something wrong with you when in reality you don't. Because you are so focused on that problem that things start to hurt when they really don't, its just the mind or you notice things that you haven't noticed before and a lot of times they have already been there. Just relax. Clear you mind. If you truly believe you have a problem go see your doctor.
Did she use a condom when licking your nipples? It is possible that you have a fungal infection either by this incident or on your own (low immunity, taking antibiotics, etc.).
As for your tongue, you can try eating yogurt with live culture (read the label) that have Probiotics in them and brush your tongue well when you brush your teeth (throw out your tooth brush after this is gone).
If this doesn't go away, you need to see a doctor to prescribe an antifungal swish and spit/swallow medication if he/she feels it is fungal. Try to avoid hot, spicy foods as this will make the pain worse to your tongue.