Is this translation correct?

Hey, I've been wanting to get a tattoo, for the purpose of reminding myself to breathe. Panic disorder, energy conservation, anxiety, ADD, whatever it is at the moment, I find myself not taking enough deep breaths. I want to have a reminder to breathe, and I figure a tattoo will do as good a job of reminding me as anything.

I have delved deep into Parf Edhellen to find as many ways to translate this idea, and these are the phrases (Quenya) that I have created.

Breathe with more breaths!

á súyanë assúyanië

I breathe

Súyan

Do breathe!

alye súya

Breathe!

á súya

I really should educate myself and just sit down and learn Elvish. I just wish I could learn it in a classroom. Language learning is an interactive process for me, and without connecting everything I learn with something else in my brain, the information has no roots and simply gets washed away by the tide of stimuli.

I think "á súya" is going to be my go-to for this. I'll use the Tengwar from the Lord of the Rings appendix to put it into Elvish script, and I'll be all set, right?

Now I'm trying to figure out the best spelling/script to use. Online translators are so jenk.

www.tecendil.com This link is what is throwing me off. It shows þúya as the Quenya translation of "breathe", and it's using the 'thorn' symbol instead of an 's'. Why? What's the source? It does look cool like that, but then, I can't find þ translated into Tengwar anywhere else that I've looked. I do think that glyph looks cooler (the red text on the page linked above).

Okay, so.....I found some fine print that says why they use the thorn:
"To indicate that a 's' should be transcribed with súlë 3 instead of silmë 8, use the letter thorn, Þ. For example: Þauron (Sauron, The Abhorred)"

So what's the difference between súlë and silmë? Two kinds of s's. I found an image showing names of letters here: goo.gl

That one shows súlë and not silmë. I'm more familiar with silmë, it's the version of 's' that my friends and I use when writing in Elvish. It's the one we wrote down for 's' on our cheat sheet.

What is the difference between súlë and silmë? Thanks!