Never call a medical school admissions office and ask to speak with an advisor or counselor until you've done your homework.
Medical school admissions offices don't have advisors or counselors. Instead, admissions offices rely on premed advisors and counselors at your undergraduate institution who are extremely knowledgeable about the application process and who probably know you and your situation better than anyone else. Moreover, they're likely to be readily available to you. If you want counseling and suggestions about how to improve your application, start with them. They have counseled and advised many students and can probably provide better personal advice than you can get from any other source. Beyond your premed advisor, there are dozens of websites with good advice about reapplying to medical school. A simple web search about "reapplying to medical school" (or some permutation) will lead you to these sites. These web sites should be a primary starting point for "non-traditional" students who have been out of school for several years and don't have ready access to a premed advisor.
Get a copy of the profile of the medical school's most recent entering class and compare your "numbers" to those of accepted students. Doing this will give you a good idea about the cognitive credentials of students that the medical school is interested in admitting. Do an objective comparison of your "numbers" with the class profile. How do you compare? Medical schools always look for good MCATs and good GPAs. These cognitive measures provide different information and both are predictive of your performance in the first two years of medical school, which most students agree is the hardest part of the medical curriculum. Another point to remember is that MCAT scores and GPAs do not offset one another. So, if both your MCAT score and your GPA are low you are going to have to improve both. A low MCAT score can be improved in a relatively short period of time by studying and re-taking the MCAT exam, or by taking any one of a number of preparation programs to sharpen your test-taking skills. You can easily find these programs on the web. Improving a low GPA is more problematic because it's going to take longer.
One of the questions that reapplicants ask most frequently is "Should I take a formal post-bac program or enroll in a graduate (MS) program, or can I just take additional coursework to strengthen my GPA?" All three options will work but admissions offices generally won't advise you to do one or the other because admissions offices don't know enough about you and your specific circumstances to make a good recommendation. Probably the best rule of thumb is to embark on a course of study that's convenient for you (nearby, flexible scheduling, offers appropriate courses) and affordable.
A related question is "Generally, how many credits do I have to take to offset or change my undergraduate GPA?" Don't forget, we will always get your undergraduate science and cumulative GPAs and you'll never be able to change them. Instead, any additional coursework will be reported to admissions offices as "post-bac" credits or "graduate" credits. Whichever program you decide to undertake your goal is to show admissions committees that you are capable of doing very well in a science-intensive curriculum over time. Is taking one 3-credit course in microbiology and getting an "A" going to change a committee's collective mind about your undergraduate GPA? Probably not. How about 15 credits of A in upper division biology classes? Possibly. How about 30 credits of A (equivalent to an entire year of full time work)? Probably. Remember, admissions committees are looking for track-histories of performance because the profession of medicine requires physicians to be life-long learners!