Hard bump on left side of tongue (under)

Hello, i have irritating hard bump on the left side of my tongue which is under by tongue, i feel irritation in my throat and tongue. I don't know the reason for it. I was diagnosed by pharyngtis reflux or acid and was given medications for 20 days but then it didn't have any effect. After that i went to an ent again and they asked me to quit smoking and gave me medicines again for 20 days. Im following everything but it isn't getting any better. I don't have any spots or pain in my mouth but i can feel a bump which is inside my tongue and i also have problem in speaking now. Please let me know what i should do to diagnose it better, after 15 days I'll go the the ent again and tell them that it's not getting better but by then i cannot understand what the problem is, i have searched whole entirety of the internet but can find nothing which is similar. Please guide in the right direction it's very depressing.