Judicial review stems from the very first line of section 2, discussing "all cases arising under this constitution". The part you cited says that Congress can determine that certain cases must be first heard in certain courts, such as federal district courts, or state courts. Only a few types of cases are first heard in SCOTUS.
Nothing about that prohibits courts at any level from making a ruling on constitutional grounds.
Judicial review is just the idea that the courts are empowered to declare legislation to be in conflict with the constitution. Appellate and original jurisdiction are irrelevant to judicial review. Judicial review is not limited to SCOTUS. Every court has the power to determine whether a law under their jurisdiction follows the constitution, but only if a claimant presents a case.
If you already know what is wrong and just need a doctor's note (and maybe antibiotics), go to the clinic. While their staff are significantly more skilled knowledgeable than the general public, their policies limit them to only simple diagnostics and treatments. Your medical knowledge is certainly less than that of the Nurse Practitioners and Physician Assistants that staff these clinics, but likely exceeds the scope of practice they are limited to by their employer. If you don't know what the problem is, the clinic is going to refer you to your PCP or urgent care anyway, so you should only visit the clinic to appease HR or get access to basic prescription medications.
If something is bothering you, but you can tolerate it for a couple weeks, schedule an appointment with primary care.
If you don't know what's wrong, or you need something more than a note and a prescription, and you can transport yourself, go to urgent care.
The only time you should go to the ER voluntarily is if urgent care sends you there. Any other trip to the ER should be because someone dragged you there without giving you a choice.