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@Wenda you might try adjusting your arm position so it puts less stress on the wrist. Play around with your neck height and the position with respect to your body(imagine a line that runs from shoulder to shoulder, where is the guitar neck relative to this line, Is it parallel? On a sharp angle forward or backward? You want to have the guitar close to the body but perhaps not too close. Try to find that position where you are in a good balance while reaching up and down the neck.
With the height, maybe horizontal neck is not ideal for you right now; as you are learning to get comfortable with your guitar it’s ok to bring things closer and more approachable and you can bring those tuning knobs closer to eye level? Play around with positions until you find something that works best.
Do watch the stretching courses that Tony put together.