What are the effects of acupuncture?

I once collapsed and was taken to the emergency room.

At that time, I also received acupuncture on my neck and shoulder through traditional Korean medicine. I didn't notice any immediate significant effects. However, the cost was surprisingly high. It was quite expensive. When I asked about insurance coverage, I found out that traditional Korean medicine treatments are not covered by insurance. Nevertheless, I was advised to continue treatment the next day, so I received acupuncture again on my lower back and shoulders. But I didn't notice any effects at all.

How often should I get treated to see results? Is there really an effect? The cost is higher than Western medicine, and insurance doesn't cover it... Should I keep getting treatments?