Hello, I also lost my credits. I am not even sure how many I had but my credit card date expired and once I went in and renewed the card info all my credits I had saved were gone. Can you see how many I had and retrieve them? I have been a customer with adobe stock and fotolia which merged into adobe stock for years.
I have checked your account and noticed that your unused credits/unused license on 8th of July 2017 is zero and therefore you are not able to see them in your account anymore.
Also, I see that your plan is not active at the moment, if you wish to renew your plan please Contact Customer Care
Please feel free to update this thread in case of any additional query.