The situations you describe with your parents and grandparents could certainly have set the foundation for your current problems. I'm happy you understand the concept of small t trauma.
An EMDR therapist would explore the client selection criteria, parameters, and possible causes of your current symptoms. It will be his or her job to help you select the appropriate targets for processing. If your problems are experientially based then EMDR can be helpful. If your problems are organically based, then meds would be the treatment of choice. With appropriate processing you should begin to see indicators of success within the first three processing sessions if the problems are experientially based. That could help to determine the causal factors and make appropriate decisions regarding further treatment.
To make an accurate assessment, make sure that your clinician is adequately trained in EMDR and conversant with your types of problem. You can access a list of EMDR Institute trained clinicians at http://www.emdr.com.