I am not sure what kind of infection
you have in teeth
but you should get this investigated as bacterial infection
in blood can cause these symptoms too—but for this to happen you will have high temperature too. The other possibilities are postural hypotension, transient ischemic attacks, hypoglycemia, low sodium, severe anemia, thyroid problems etc will have to be ruled out. Please do not waste time and consult a doctor ASAP.
Hope this helps.