I have the feeling of light headedness & sometimes a light head & nausea.  I have had problems with receding gums & infection in my gums, when I have an infection I get the same symptoms.  I have just had my two bottom teeth extracted, however these symptoms still come & go.  My bottom gum & chin still ache from time to time.  I might add that I have MS.
Thanks for your query, I have gone through your query. The pain in the gums and chin could be because of the gum infection. You have to get your teeth cleaned once for this. The nausea and light headdress is not related to the gum infection, it could be because of antibiotics taken for gum infection(if you have taken). Consult a general and oral physician to rule out other possible causes, I hope my answer will help you. Take care.