You did not say which drug you got. But the standard treatments for AML use drug combinations. There are several to choose from. And Drs also give some extra drugs to protect you form infections and altered biochemistry. You need a specialist to fine tune all of these prescriptions for you!
I am 78 y.o.; diagnosed last fall. Began Azacitidine + Venetoclax as my chemo combo in December. For me, the rx worked very quickly to reduce my blast counts; I went into "morphological remission" in only 3 weeks! And I only became mildly nauseous most days (that treated easily with rx). The catch is that you must repeat rounds of these drugs every 4-6 weeks. But it is only 5 days of IV infusions at the start of each cycle. These are simple, non-traumatic IVs running into my port (usually about 15 minutes total). This is doubled up with pills of Venetoclax, those taken for 2 or maybe 3 weeks straight. After that a 2 week break until the next cycle begins. Some people get sick in early months of treatment: more do not. Ven/Aza tends to be the treatment used for older people. It must be continued indefinitely to keep the AML at bay. Look for a center which knows how to handle these drugs. You may kick your AML to the ground for a few years, at least.
Good luck!