Congrats on a good recovery!
As you experienced, influenza is a respiratory illness - what people call 'stomach flu' or 'GI flu' has nothing to do with influenza.
Did you have the vaccine this season? Not too late to get it for anyone not yet vaccinated, even if you already had the flu.
Next year, I'll be going for the 'high dose vaccine' which is intended for those of us 65 and over. Went with the regular vaccine this year, as it is free for employees of the hospital where I work and easy to get in the same building as my office.