You can place requests for multiple aspects of your life. You can prioritise your wish and send more energy where requirement is more.
You can manage multiple healings by designing your healing methods for easy healing.
Like some healings through energising water, some through direct request, some through wish manifestations, some with affirmations.
If you do multiple affirmations, it may be confusing for your own mind.
How to prioritise wish manifestations, you can read this article on Nine gems.