What is your status on CEAC? Has the case file arrived at the embassy? As noted by others, appt opening are limited. As for the medical with the way things are in the Phils now it may be a good idea to wait until you have the interview date.
You can call to schedule by calling
Scheduling the Interview by calling:
Call (632) 854-882-23, (632) 779-289-88. This service is open Monday through Friday, from 8:00 a.m. to 8:00 p.m., except on Philippine and U.S. holidays. Callers may speak with an English-, Tagalog-, Ilocano-, or Cebuano-speaking operator.
Applicants, agents or petitioners calling from the United States may also use this service by calling (703) 520-2235.
This is the visa application process:
https://travel.state.gov/content/travel/en/us-visas/immigrate/the-immigrant-visa-process/step-5-collect-financial-evidence-and-other-supporting-documents/step-6-complete-online-visa-application.html