Given that he hit his head and is now complaining of sore ears, yes. You should take to see the doctor as soon as possible, even if only to find he has nothing more than the usual headache.
Bludgeon your self
You should contact the manufacturer of the swing who should be able to mail you a copy of the instructions.
The door should swing into the room if there is more space inside, or swing out if there is limited space inside.
Thats up to you, If you practice your baseball swing properly while playing whiffle ball you will be improving it not hurting it. Whiffles are used as a close quarters and reaction drill, and when space is limited such as bp before a tournament.
You should swing it like an iron because normally its not used on a tee, if you swing it like a drive on a fareway then you are going to miss the ball.
When installing a backyard rope swing, it is important to ensure that the swing is securely attached to a strong and stable tree branch or support structure. The rope should be inspected regularly for wear and tear, and the swing should be tested for stability before use. It is also important to clear the area around the swing of any obstacles or hazards to prevent accidents. Additionally, users should be instructed on how to safely use the swing and should always wear appropriate safety gear, such as helmets and closed-toe shoes.
The direction a swing door should open depends on the location of the hinges. If the hinges are on the right side, it is a right-hand swing door. If the hinges are on the left side, it is a left-hand swing door.
The recommended clearance footage or "fall zone" for a swing set should extend a minimum of 6' from the structure on each side. The fall zone in front and back of the swing should extend out a minimum distance of twice the height of the swing as measured from the ground to the top of the swing support structure.
You may be putting too much stress on it. Have someone check your batting stance, and swing. Maybe he/she can spot what is wrong with how you are holding the bat.
If you want a canopy for your swing seat you should check out amazon.com. They got a large inventory of different models and colours on their canopy swing seat.
Out away from the pool.
You should check with you local paper's classifieds or Craigslist to find a swing.