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One other thing not yet mentioned is that if your saddle is angled with the nose pointing downward then your weight is pushing you into your bars, forcing your arms to support more of your weight than they should, which could account for arm pain.
You want to "level the saddle" although it's a little confusing. The key is to get the _middle third_ of the saddle to be level with the ground. However, the nose tip may taper downward on some models this way. The bulbous rear third will either be level or commonly somewhat higher than the middle in profile. Your sitbones will crush down the rear a bit and also this helps from sliding backward too easily.
Your weight should be fairly equally balanced between the three points of contact with the bike: pedals, saddle, and handlebar.
Think of your saddle more as a perch than a seat.
I think the stem reach is a valid issue but mostly your body is probably not used to cycling yet. Hang in there. 30 miles is more than a little ambitious for a new rider, especially on a bike you haven't dialed in the fit on.
