"Do you think this is grief for Gramma or maybe my meds (Lexapro, Invega, Gabapentin) need adjusting? Do you think a Life Coach might help?"
Both are possible. What you're going through may seen as initial shock at her passing and then delayed onset of bereavement. You've mentioned several conditions that you're struggling with and these can intensify your reaction to her crossing over.
If you're dealing with all of the issues you've listed, a reevaluation of your meds would definitely be something to consider with your MD.
A personal coach may not be the best option given the severity and multiple conditions. Working with a therapist and your psychiatrist would be a better option.
Are you receiving your care at a private practice or through your community mental health center? The latter generally serves individuals on limited incomes or without insurance. These centers often provide both psychiatric care and counseling.
Many pharmacological companies offer financial assistance programs for individuals to be able to obtain their medications. You may find info on how to apply for these either on each individual pharmacological site or at rxassist.com
A list of Community Mental Health Centers
Feel free to clarify if this is what you were inquiring about.