Hello,
First off all think about if you got any medication before two month .it might influenced your gut Flora which causes smelly flatulence and now cranker inside your lip.
If you did not get medicine then secondly it may be due to deficiency off mineral or
vitamin.in this condition you should have take mmultivitamins. and plenty off fruit and water for 7days.
For your swelled lymph node in arm pit go to your nearby general physician.He or she will check it physically and will further diagnosed.lymp node at this location enlarged due to various reasons like infection in hand or breast,or any systemic infection,TB,malignancy etc.so without losing time take a visit to General physician.