googling is the worst thing you can do! i've diagnosed myself with countless conditions on there, only to be told by my doctor that its nothing!
like you said, the fact that your first stop went down and your ulcer healed, is a good sign. i'm pretty sure if it were something bad, the ulcer wouldn't heal. the lumps are probably from trauma or maybe just an infection. when i bite my tongue i get a lump sometimes too but the lump usually goes away in a day or 2.