.

etwas mehr Kontext wäre gut.

I just wanted to send a text saying that I am thinking of that person (the dot, dot, dot just strengthens the statement)

It's just a phrase that people write on greeting cards, usually to send to a person who is having a difficult time, but sometimes just to say hello and stay in touch. (I wouldn't say the ellipsis strengthens the wish myself, but that's a matter of taste.)

http://images.google.com/images?hl=en&q="thinking of you" card

'Sympathy' sounds quite formal and usually implies a death, and 'Get well soon' can sound too casual when an illness is more serious.

What phrase do Germans usually use on a card or short note like that to express sympathy or friendship?

<http://images.google.com/images?hl=en&q="thinking of you" card>

Mit hms Erläuterung:
Ich denke an Dich!
etwas formeller: Meine Gedanken sind bei Dir.

Letzteres würde ich benutzen, wenn es um größere Problem, z.B. Todesfall oder so geht.

'Ich denk' an Dich' benutze ich schon ab und zu.