Acatenango Guatemala advice

I'm in Guatemala right now and was planning to hike Acatenango (I'd even booked it) but have heard the altitude sickness can be really bad. I'm not worried about handling the physical aspect of it, its really just the altitude sickness and worry that its dangerous. I'm a 22 yo female and I've never been at high altitudes so I'm worried I'll end up reacting really badly. I also got some altitude sickness pills from my doctor but then have read that they can actually be bad and mask the effects of altitude sickness?? I probably sound very paranoid but I've just read some concerning things while researching about it and would appreciate any thoughts!