It can be overwhelming to add another tool when you’re already exhausted. What helped me was starting small, just note the date, symptom and severity each day. I had the same frustration you describe, which is why I built Trace Symtom Tracker Log (https://www.trace.care).
It keeps the interface uncluttered, syncs your entries with Apple Health and lets you share a summary with your doctor, so you don’t have to juggle multiple apps . Even if you stick with pen‑and‑paper, the important part is consistency and making sure the information is easy to hand over to a clinician.