"I've been doing a lot of training in the past but it never was painful like it's now."
When I choose to use different sentence: It never hurt like it (does/is) now" then which auxiliary verb do I have to use? (does or is)
If the answer is does ("it never hurt like it does now") then how could it be that "does" and "now" combine together grammatically? (I know about exceptional verbs such "see" / "feel" etc.) Here when we are talking about "now", we are actually talking about present progressive (is/ are - auxiliary verbs) rather than present simple (do/does auxiliary verbs).