But you make it seem so easy!

Regardless of assigned birth sex, everyone can get breast cancer. Including those who were assigned male, cis men never ever think it can happen to them. But it can, and it does. Also, just for your own future safety - you should be feeling your breasts for lumps and bumps fairly regularly (see weekly at the least often) but that includes the tissue that goes up into your arm pit. Breast tissue extends quite far and anywhere along it can get cancerous.

Taking feminizing HRT does increase your risk of breast cancer - to juuuust under cis woman levels of risk lol. Breast development could be misdiagnosed as cancer, sure, especially if it's a doctor who is very very unfamiliar with breast development but I'd doubt it. Getting your breasts checked now should help you feel better, especially for a lump that was already there before HRT. It's probably going to be nothing.

Could be testicular torsion or a hernia (yes intestines can herniate into your balls) or a cyst. Better to get it checked. Torsion is an emergency but if that's what it was you'd probably be laid up in an ER - they're quite painful.

This is gross but a friend of mine is an ultrasound tech, and they do indeed do ultrasounds on testicles. Anyway, she had a young guy in - mid 30s - who's one ball just didn't exist anymore. He used to have it, but he ignored the pain and over the years of that it just fuckin died and turned into liquid before being reabsorbed. Kinda freaky.

Eventually we have to consider it abandonment but parents have a wide latitude in deciding the course of their kids' treatment (we try not to do things without consent anymore or against parents' consent). We eventually convinced these parents to allow us to put on nasal prongs for oxygen in their kid, I didn't push it and ask if we can draw bloodwork or start an IV now and just let her scream it out until she fell asleep.

I was getting DV vibes or controlling/emotional abuse vibes from one of the parents but I couldn't get them to leave so I can ask the kid and the other parent, which is always frustrating. No suspicious marks and they followed instructions on not yelling and swearing in wee hours of the early morning on the pediatrics ward after they did the one time so I have no basis for separating them out. I've seen one parent and their kid be pretty compliant and good and then the bad one shows up asking why we're doing stuff and threatening to leave AMA and yelling and cowing the kid and the other parent to stop taking treatments and it's all very frustrating

Cluster B is typified by things like bipolar or borderline personality disorder. Everyone is a little unpredictable but cluster B traits can make people VERY volatile and unpredictable. It can be from emotional lability because someone with bipolar depression can have that bipolar causd swings (even rapid swings or mixed episodes) or because the person with cluster b traits feels emotions VERY intensely that don't really go away like in borderline personality disorder. There also tends to be a lot more splitting/black and white thinking, as in "everyone and everything can be neatly separated into good or bad." A classic feature of borderline personality disorder is having a Favorite Person, someone you think can do nothing wrong, who you might obsess over and ruminate on, someone who might not know you but who you fear will abandon you. And so on. Cluster C is more the anxiety zone. I have OCD which is in cluster C. Sometimes it includes people who are very inept socially.

Cluster A, if you were curious even though you didn't mention it applied to you, is stuff like schizophrenia or paranoia - disordered thinking.