"Who actually tries to off themselves using aspirin?"
.....and tylenol... In my experience, children and adolescents.

With regard to the buying limits on pseudoephedrine, whether or not it is helping depends on the local meth lab situations. I'm told it is helping where I live. But anyway, the number I've been legally permitted to buy has been enough for several courses of treatment, so I can live with the PITA.

For your carry FAK consider NOT using a combination product. For my in-the-field-FAK I use benedryl (in the US they're available OTC at 25mg. dosages) BECAUSE it can make me drowsy in the 50-100mg dosage and thus can pinch-hit for an occasional sleeping pill. There are also (for many people) some mild anti-vertigo properties..thus it can help motion sickness for some of us. And it seems to act faster as an antihistamine for insect stings than does loratadine (at least for me). I use pseudoephedrine if I need the decongestant effect.

For my AT HOME, every day use..space and multi-function not an issue.. I don't care about the alternative uses of diphenhydramine so loratadine (Claratin) is o.k. But I don't use Claratin-D (the D being...pseudoephedrine..) I use the regular.. and add the D .. pseudoephedrine as needed.
For me, typically what "they" decide is the right combination of the two isn't what I decide. So I avoid the combined products. FWIW

Also, I'd not use Dimetapp with Benedryl. Dimetapp uses the antihistamine Brompheniramine. You'd be getting two antihistamines, and I don't understand why that would be helpful. Dimetapp also contains as a decongestant the drug Phenylpropanolamine: which has been associated with an increased risk of hemorrhagic stroke (bleeding into the brain or into tissue surrounding the brain) in women. Men may also be at risk. Although the risk of hemorrhagic stroke is low, the U.S. Food and Drug Administration (FDA) recommends that consumers not use any products that contain phenylpropanolamine. Now I guess I'll get flamed by the Dimetapp lobby. But this is just my preference YMMV