I've been keeping P standingi for 10 years now. She is one of my hatchling's who is now almost 7 years old, so I know where she came from

Everything has been going well with all of my animals for a couple years now, no issues at all, which is why when I started to see her getting thin, I got worried. At first I thought she was fasting because she was going to shed, then she never rebounded from it. I moved away from the vet I used to see (who was great), so I found a new one to take her to closer to home, to avoid the stress of a long car ride. This guy supposedly has seen reptiles for >20 yrs; however, I wasn't impressed. He was not very helpful and I regret not taking her to our old vet. He told me there were alot of worms and eggs, but couldn't tell me what kind or how she could have picked them up. My thought is the crickets. I buy them in bulk from Flukers, so maybe I will change my vendor. Any suggestions?
As far as husbandry goes, I clean all the gecko cages every 3 months, which includes removing all the logs, plants, etc, and disinfecting everything with chlorhexadiene. I remove all the substrate and replace with new as well. Plus, I remove all waste from the cages daily, or when see it. I plan on giving her cage a good cleaning as soon as she gets her second treatment next week.
She has been off and on with her bowel movements being normal and runny for a couple months, which thru me off.
Have you dealt with nematodes before? Are they difficult to rid?