Oscar is always really fizzy when I ride him, no matter if I lunge him beforehand and he’s been ridden throughout the week. Is there anything I could do to calm him down?

High magnesium feeds are ment to be good for calming
Consistently and a low starch/sugar diet can really help
Changing to a cool energy feed program, speak to a nutritionist.

Calming supplement such as Omega Alpha Chill. Many others on the market.

A consistent workout program for the horse 4-6 days a week. Consider lunging in the morning and another 15 minutes before your actual ride.
Supplements, consider changing his feed
You can use calming supplements. A bunch of different brands carry them
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