This is a very good question. You have been to doctors but haven’t felt heard or helped. I’m sure you are not alone in this. I do have a few suggestions:
You didn’t mention what kind of doctor you saw. I always suggest that people start with their primary care physician. Sometimes symptoms like those you describe are due to an undiagnosed medical problem. If you haven’t had a complete physical check up in a while, it’s a good idea to do so. You might ask the doctor for a referral to an endocrinologist as well since thyroid issues are often a contributing factor to fatigue.
If you are medically fine, then you may benefit from seeing a mental health counselor for an evaluation. It may be that you are underestimating stressors of the final year of school. Perhaps you are dealing with a sub-clinical but still significant depression. Or it may be that that you are more anxious about life after school than you are acknowledging to yourself. Those are only a few guesses but are certainly things I would explore if you were my client.
If you have already seen a counselor but were not helped by the visit, consider getting a second (or even third) opinion. Success in therapy often has to do with the “fit” between therapist and client. You owe it to yourself to look for a therapist that you feel comfortable with and who you believe you can trust.
I wish you well.