I'm so sorry, I understand how you feel. After my friend died I felt the same way, not long after that I found some abandoned kittens and helped them. That would have been the first time I was happy after that.I just got done talking to my mom, and I don't know if I'm gonna be allowed to get anything else for Hank.
She was freaking out because I don't really think she understands that "food and stress coat," especially in a 1 gallon tank, are not all a betta need to survive. She said that with that they lived about 5-6 months. I told her bettas can live much longer than that.
She also came to my room to check out Hank to see why I was so worried about him. She believes that bettas lying on the bottom and gasping is normal. I asked her about the API test kit since she has the Amazon account and the debit card but she flat out refused because "I'm too invested in this, maybe we'll just get you a plant next time because they're harder to kill."
I'm really disappointed. I am obviously going to continue to do everything I can to keep Hank alive, but I thought that my mom would be more understanding for all of this. Ever since my brother died I've been really bummed, but while Hank was healthy and exploring that was probably the happiest and most fascinated I've been in a while. I really don't want him to die, he's supposed to be my little buddy.
You mom is probably stressed like you, talk to her, maybe show her this thread or the TFF betta care sheet.
I still have not been able to convince my grandmother that a goldfish cannot live in a jar, so if they have the idea in their head of the care if may be hard to change her mind