Dear friend,
If concentration and memory retention are your only problems, that can be treated without medicines. Probably you had made laziness as a pattern from your adolescence which was a characteristic then.
Follow the below given lifestyle changes and check if it is effective.
1. Avoid non vegetarian foods
2. Drink more water
3. Go for walks atleast 1 hour a day.
4. Sit comfortably and inhale through your nose and exhale through your mouth. Repeat 10 times morning and Evening.
Follow these atleast for a week and see if there are changes. If your condition improves, them come for a weekend retreat.
Wishes
Next Steps
Follow the steps given
Health Tips
if you find any improvement come for a weekend session