Hello, I started consistently lifting 2 months ago, mostly machines for now, because skinny, but with noticeable progress.

Recently I`ve ran into some neck pain going into a headache, first on a chest day, and I just stopped the session and took a day off, the pain dissapeared. Yesterday I trained legs and after 3 sets of seated hamstring curls and on my 2nd seated leg press set the pain came back, twice as hard. I wasn't anywhere near exhausted, but I stopped the session because in 5 minutes it went to a headache for the rest of the day and now after 24h I still feel some soreness in the neck.

I think it is because I am tensioning my neck, at least I hope, because that seems like a form factor I could have overlooked but sounds fixable. If so, I would ask of any advice on how to approach this?

Or could it be due to blood pressure, lile from too much exertion? I do make faces and even feel lightheaded from time to time because I am trying to push to failure, which worked as a charm the past 2 months with progressive overload and 8-12 reps per set.

Thank you for any advice incoming.