Slurred speech and trouble with words.

So my husband has been having increased trouble finding words, and more so having a little slurred speech. He had symptoms like this before his original surgery to remove one of his tumors in the left parietal lobe, but also has a tumor on the rear of the left frontal lobe don’t know if this is just increased brain swelling or if I should be more worried? I talked to the doctors and they’ve restarted dexamethasone 4mg twice a day again. But this disease is already being an asshole and I don’t know when to worry more.