It is written in a very colloquial register, and it employs a way you may not be familiar with, and there is nothing wrong with it grammatically (except that it would be clearer if there was a comma after sad ).

• Where formal English may employ as, the colloquial part is the use of like where formal English would employ as. Is more appropriate when an emotion compares the emotions of a girl and her feelings to those felt by a person, another person, after (the person) experienced something…. The experience, the object of at, may be expressed as a noun, as a gerund clause, or as a finite-verb clause Here

  are examples with a noun and a gerund phrase: “… feeling sad—like after a lousy day at the office or a fight with someone you love

  It’s a good sad, like after watching a really tragic movie and you’ve just cried your eyes
  out while eating an entire box of chocolates”

  He was still sad—like after you left I feel sad (like after we lost the girls)

  Do you see that sad is a ‘generic’ or ’caused’ event which occurs repeatedly or might occur at any time? Why?

• The other thing that can be confusing you here is the use of have, which may feel to you like the beginning of a perfect construction. There is something quite different. neither a perfect auxiliary nor a causative auxiliary (as in to have something already done or have something done”) but the lexical verb used to mean “experience” or “suffer” and taking as its direct object a non-finite clause with a bare infinitive (an infinitive not marked with to ) as its head. Hence:

  She had her house burned down = She experienced her house burning down.

  Is there any other way to deal with a loved one passing away?

Can you describe what it means to be an individual?