I'll try make this clearer: DLD is to me one of the best experts here when it comes to PE (clamping excluded which he doesn't advocate for different reasons, but there are other legends here who do it successfully, so you see there are various ways that lead to success), his knowledge and experience there is second to none and - I can't stress that enough - he's an unbelievably kind and altruistic guidance for a lot of PErs (me included), but when it comes to medical symptoms there are just some misunderstandings flying around here, that can be attributed to a lack of medical knowledge and which can't be outweighed by personal PE experiences.
I'm not a med. doctor either but, like I said before, I went to a really good one which I've known for many years (and moreover I conducted some further research myself). And although I didn't tell him about PE, he - as any other individual who has studied medicine - for sure has seen a lot irritated veins and also thromboses. So he knows what the possible consequences are and which therapeutic measures are required (or aren't for that matter), since such symptoms are just basic knowledge of medicine. It doesn't matter in this case if you have it in your dick or your legs, the knowledge applies here anyways. And in such a case it wouldn't be (and isn't) a matter of second thought to me which instructions I ought to follow.
And yes, with just letting it rest and a bit of Aspirin you're on the safe side (cooling is an option but I didn't do it as well because I don't like having sth. cold on my dick, lol), especially because your injury is really minor and only a phlebitis that hasn't even evoked a blood clot. So you should be good within short time.
PE and the medical community, yea that's a tense relation: I guess your M.D. as many others felt threatened in his professional authority because this - contrary to the symptoms that can be caused by PE - is something that you won't find in any med. school book and especially doctors, given the long and honorable tradition of their profession and the high social standing comes along with it, have built a certain arrogance. That makes it hard for many of them to accept alternative methods and there's is strong lobby working against, for example, chiropractics and the likes. PE is even more unknown, so go figure what the expectable reaction to such a phenomenon would be.
But as always, there are certain individual exceptions: an open-minded doctor whose self-esteem doesn't rigidly rely on the alleged superiority of his job will think twice about the techniques of PE and the involved mechanics with respect to the anatomical constitution of the male genital. I remember a thread here from the user "Neutronstar" about a Urologist who actually gave him valuable tips to improve his PE game. Sadly, Neutronstar deleted all his posts and stopped posting altogether, iirc that was due to some not only skeptic but outright derogatory and deprecating comments from some other guys here on the board. Maybe our archive manager Zam can tell you more
All this is very sad, because medical specialists with their knowledge about the penis could help optimizing PE and answer many important questions we as laymen can only intuitively answer or not answer at all. I remember one very enlightening comment on the jelq from a guy who studied medicine or biology. It would be great to have more of them here on the board.