As others have said, it's highly advisable to purchase travel insurance, as I have done. It's important to note that insurance is not exactly a product you buy to get regular medical care. Insurance is a product you hope never to have to use.

I have insurance for my travels. However, given your medical history, the premium may be more expensive.

As Amy Scott has said, purchasing your prescriptions privately in some countries may even be cheaper. For example, I was in Thailand this year and had two medical visits. One was to a dental surgeon, where I had three fillings, a deep clean, and a checkup. The whole place was super clean and very modern. I paid privately, and it cost about £50. In the UK, I would have paid about £300 privately. I also went to the hospital for two injections and some malaria pills. As I was paying privately, I was seen to, and it all cost me about £60. In the UK, I got a quote for this amounting to about £450.