No one can determine by two yellow leaves if your plant has been overwatered, sorry. I wish it were possible!

I can tell you, however, that sticky stuff on your plant almost always means that there are (or have been) piercing/sucking insects or mites in residence. Look for small spider mites, scale insects, mealy bugs...just to name a few. You would not be the first person to overlook a bad scale infestation along the stems.