She has given me a difficult choice!

A few days ago, my girlfriend asked me to stop taking painkillers that my doctor prescribed because I had a muscle injury. She said she was worried that I would become addicted to them. I was surprised because I have not given her any indication of being dependent on pills. I know where she’s coming from because her brother had a problem with drug abuse, but this is starting to feel like paranoia. She is now threatening to leave me if I don’t stop, but I can’t ignore my doctor just to save my relationship with her. It’s unfair and almost childish behaviour and even though I am trying to empathise with her, I think this is unreasonable. What should I do? If there is no way out, I may have to end this.
If your girlfriend chooses to speak about something she isn’t qualified to, you have to do what is best for yourself first. This is a medical issue, and your doctor alone has the right to comment. It’s unfortunate that she feels this way, but you’re right to prioritise your health over this relationship, given that it has a direct impact on your well-being. What you can do is acknowledge what she’s saying and explain that you understand but point out that you will have to override her concerns. Give her insights into how long you have to use the pills and why and ask for time so she can see that this isn’t something she needs to worry about. If that doesn’t work, it is unreasonable, and you will have to make a call on whether this relationship can be saved. If she is willing to walk away, it’s also a sign that she isn’t going to consider where you’re coming from.

How do I know if someone spends time with me just because they get an ego boost?
It’s harder to sustain genuine interest in a person over multiple meetings, so trust your instinct and see if there is any reciprocity of feelings.