What can I do about slippy gears on a 1994 Honda Accord Wagon? Transmission flush?

The transmission is there, all gears work, but it's having trouble shifting. Sometimes during shifting, it doesn't fall on to the next gear and the revs go up as if it slipped. The best way to help it is to ease of the gas when it's about to switch to the next gear. I noticed the gears shift better when the car is colder and has been parked overnight. However the problem comes back if I need to go faster and the RPMs are higher, and when I get off the highway where I've been cruising on 4th gear for over 20 minutes.

Went to the auto-part looking for transmission fluid thinking it was needed. The auto-part specialist said it might be metal residue in the gearbox mixed with old pasty transmission fluid that makes it slip, not letting the transmission fall into gear. He told me not to use anything "not Honda quality" or additives at all. Instead he recommended a "transmission flush" before I start panicking about a very costly new transmission.

I'm aware the prices for a transmission flush go from $75 to $200 depending on the car make and model. This is a high mileage car at 50k+. Should this also be a consideration?

This 16 year old car has been with me half it's life and it's been very good to me. Saves gas and the wagon design is great to haul stuff. It's taken me many places and taken me to the same place many times. I really can not sell it to buy another one at the moment.
 
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