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You may be having some viral infection as the cause of painful glands or if you have any sore in mouth or oral cavity then it may be of bacterial origin as well.
The sweating and sore tongue may be a result of vitamin deficiency
in some cases.
You should get a complete blood counts and also get evaluated by a physician of your locality.
Meanwhile you can start a good vitamin supplement if you can find it over the counter.
I hope the advise would be informative and useful for you.