I'm not doing too great, health-wise, but I just wanted to respond to this...
Scientia, a human being, is a human being. We feel, shit happens, and it hurts. It does not matter what your type is. Being T/F, also does not mean you feel things any less, nor any more. If you're implying that you want to be more "T," and you're an INFJ, that's implying that you want to be an INTJ. Being an INTJ doesn't mean that you feel less. That things affect you less. That you're any greater at coping with feelings. Not at all. You're human. Shit hurts. You aren't just your type. INFJ? Those are four letters that apply to millions of people, each of whom are different. INTJ? Those are four letters that apply to millions of people, each of whom are different.
I can assure you, being "T" or "F" doesn't make anything different, nor easier, nor harder. Pain is pain. It's a bit of an insult to people who are "T," to tell them that they experience this pain any less. I am sorry for your losses, and I am sorry for your vulnerabilities, but changing one's type has no application here.
You are you. You can change yourself, but you are you. We are all human, and we are complex, strange creatures. Honestly, when trying to understand someone, I don't give a damn about their type. I try to know them, as an individual. Try to know yourself, as an individual. Shit hurts. It doesn't hurt any less, if you are a "T." We just have to get through it.
I just... honestly... I've known so many people who are "T" types, known them deeply. It doesn't make anything easier. It doesn't weaken feelings. It doesn't even remotely touch upon who they are, as individuals. I hope you get through this okay, but please understand that one's type doesn't make feelings any easier to endure.