Adding to the comments, in my opinion the infesting organism should be identified first, but I wouldn't rule out other types of "undetected" infestations. That's why I'd start to focus on the problem from a "worst case scenario" standpoint. It's much safer [and effective] that way.
If some other organism not susceptible to Albendazole is detected, I would STILL take at least several "warming" rounds of Albendazole, because it's a drug that covers a broad range of infestations with virtually no side effects, and it could "open way", so to speak, by killing any other "competing" worms.
If Albendazole is to be used, to be on the safe side I'd suggest to start a VERY LOW test dose increasing it slowly for a couple of days, and then I'd increase it suddenly to the maximum recommended human dose in short bursts (at least 7 days each burst, 3 weeks rest - but that's really up to the doc).
This approach has given me a very good idea of where the infestations are, how heavy they are and what to do next.
You'd be surprised what can be seen on a live wet mount.