There could possibly be a couple of issues going on here.
The yellow tongue is likley to be oral thrush and is treated with oral fluconazole capsules or a nystatin suspension.
Sudden onset swollen tongue may be an allergy, however a slowly developing swollen tongue may be a vitamin deficiency and so you need blood tests for vitamin B12 and folate.
The color of the stool may indicate fast gastric transit however if your urine is very dark orange then you do need to have liver function tests to check bilirubin. You do not develop obvious jaundice of skin or eyes until bilirubin is over 100.
The sweating may be the menopause or may be due to either infection or possibly alcohol withdrawal. If you have the shakes then you need to see a doctor for evaluation of alcohol withdrawal.
Weight gain may be due to increase in calories however I would suggest that you have your thryoid level checked.
There is no doubt that drinking to excess can have side effects, however you will need a full assessment in person complete with blood tests to see if the liver has been damaged.
In the meantime do drink plenty of water.
Can I get ?oral fluconazole or nystatin susp. over the counter?
You may be able to get oral fluconazole. If not..ask the pharmacist for a miconazole oral gel which can be used applied to the tongue instead.