@Moi: I think you're just Highly Sensitive and people often call such people oversensitive. Also you most probably need some kind of therapy (who doesn't?) and maybe through that you would learn about stabilizing your emotions. I know I can get real extreme with emotions and therapy is definitely helping me, as well as Youtube, lol XD Psych2Go has great short psychological content, for example. Understanding your mechanisms leads to accepting yourself as you are without seeking external (in)validation, and also leads to controlling yourself better. Surprisingly there're many thinking patterns and codepencences that we as humans hold on to like it's the last thing we have and they are actually harmful or at the very least not helpful. Letting go is more often than not the right answer. Although it's not easy.
Sometimes I feel I'm going unintentionally preachy, and I think that's now
@jacob: Maybe after thhis project you'll need to rethink your rates then, so nobody will be killing you like that
You could also say "hey, dumbass, if you keep taking my time with video calls then I'll have to reconsider the rate we agreed on, because that's more demanding than my usual projects". Couldn't you? I mean, it's tough love but if you've told him already how you feel about video calls, then if he's making your work extra hard you should raise the rate for him. It makes sense to me although I don't know how to make business in the UK, perhaps I'm wrong
