[2019] Theoretical perpetual Shock with Leper's Alms and Maligaro's Restraint.

Shared Suffering does not transfer ailments from you to enemies. It means that : a) If you have a specific ailment, all your hit damage is counted towards causing that ailment on-hit. b) If you inflict an ailment, all ailments of that type are removed from you.

So assuming you do enough total damage to inflict shock, you'll shock the enemy, which because of reflection also shocks you again (you have two shocks now). Then all shocks are removed from you.

1) No. First the damage of the hit is calculated. You aren't shocked yet, so that modifier isn't in effect. Then the calculated damage is applied to the enemy - this shocks the enemy, and because of the reflection, the same shock application also applies to you. Once shock application is done, shared suffering sees that you applied a shock, and thus removes shock from you.

2) I'm not clear on specifically what you're asking here, could you please clarify in more detail what interaction you're asking about?

The "take x fire damage" will occur (potentially igniting you) before the removal of ignite. In this case both are caused by the same thing, so this is effectively arbitrary, but it's that way because internally stuff that is explicitly only for a specific ailment (Eye) happens before stuff that's general for any ailment (shared suffering removing) due to the way the code is structured.

Eye's "take fire damage" is part of the "apply an ignite" process, where shared suffering removing ailments is part of the "apply all the ailments this hit will apply" process, which is a step "further out" - so it occurs after all the individual ailment functions have been called.

Brands are your hits. Traps, Totems and Mines are spearate entities from you that hit things themselves.