The greatest concern is that of brain problems such as tumor
. The symptoms your mentioned constituting difficulty in concentration, losing strength in the left hand, blurred vision
, losing control when you stand and talk/debate support these. If the symptoms are of sudden onset, then it is likely to be stroke ( if you have hypertensionalso); if gradual, then it is likely to be tumor; in all the situations, immediate medical attention is required in which first major investigation will likely involved brain scan; crucial to diagnose disease brain diseases. The early you seek medical attention, the better the outcome.
Passing gas regularly could be due to your feeding, may only be problem if persisting, feeling of hot air is likely a symptoms you feel when pressure is being equilibrated in middle and outer ear. Should not be of great worry except persisting.
So contact your dr immediately for the brain problem to be investigated.
Wish you Good health