Here's the form I typically use:
May I be happy.Then you repeat that using the pronouns he, she or they as appropriate.
May I be well.
May everything be well in my life.
I happened to find another form (this one by Jeff Brantley) that I've mentioned before on this blog (but not for several years now):
May I be happy.It's a little more specific than the first one and can really be helpful in times of anxiety or confusion.
May I be healed and healthy.
May I be filled with peace and ease.
May I be safe.