Asthma and Injectable Medications

Since catching COVID, my pre-existing asthma worsened, and I couldn't get it under control even with steroid inhalers, anti-allergy medication, and herbal medicines (such as Gokoto).
Before I knew it, I was visiting my seventh respiratory specialist.
Even if they were listed as respiratory specialists, their backgrounds were often in cardiology, or when I went to a general hospital with a referral letter, they would just run tests, tell me what I already knew—that it was asthma—and keep my medication the same. I was struggling when I finally met a doctor who told me that it could now be treated with injections instead of oral medication.
However, I was told it would be quite expensive out-of-pocket, so I couldn't say yes immediately. I received some emergency oral steroids for the time being and went home.
When an attack wouldn't subside, I would take a larger dose of steroids and visit the clinic as soon as possible.
However, a typhoon formed in the middle of that week, my asthma worsened, and the steroids barely had any effect, which terrified me.

The doctor proposed two types of injections.

1. The top recommendation is Tezspire.
2. If you also have atopic dermatitis, Dupixent is also an option since it can treat both at once.

Cost
1. Tezspire: 170,000 yen per dose
2. Dupixent: 60,000 yen per dose

Monthly cost
1. Tezspire: Self-injection once every 4 weeks, 170,000 yen/month
2. Dupixent: Self-injection once every 2 weeks, 120,000 yen/month

Side effects of concern
1. Tezspire: Arrhythmia, heart failure
2. Dupixent: Herpes, conjunctivitis

The actual cost doesn't change much if you use the High-Cost Medical Expense Benefit system, but as someone who is easily frightened, I am concerned about the side effects.
Since I have had atopic dermatitis from the start, I chose Dupixent, which seemed safer.