New Vegas: Sudden missing meshes?

[Daniel The NCR Veteran]

Hello, I was wondering if I could get help on this, I have been playing a modded New Vegas for around 60 hours now (savefile time) and I got to Honest Hearts, everything was loaded in fine, I've never had any problems until now, areas were loaded in fine and all that. But at some point, I wanted to stream New Vegas on Discord and I went into the launcher first to tick "Windowed" (for technical reasons) and then quit the launcher and launched the game through my Mod Manager (FOMM). As I loaded into the save, I immediately noticed the red diamonds with exclamation marks on them which means I had meshes missing. My load order hasn't changed, I didn't change any of my mods either, atleast looking at FOMM, that is. I managed to use the console and I had all sorts of things missing: radio towers, refugee tents, wooden bridge parts... This happened in areas where I also went into before like the Morning Glory Cave, suddenly things just didn't load even if they did before.

I'm using xNVSE on a 4 GB patched NV with the following specs:
AMD A6-3420M quad-core 1.5 GHz
AMD Radeon HD 6520G, 512 MBs of VRAM
4 GBs of DDR3 RAM
Windows 10 Enterprise N

Graphics settings: everything turned off/lowest possible with only a few certain LODs turned a few notches up, 800x600 stretched

This is my load order that I had from the start up until this point:
FalloutNV.esm
LonesomeRoad.esm
OldWorldBlues.esm
HonestHearts.esm
DeadMoney.esm
GunRunnersArsenal.esm
TribalPack.esm
MercenaryPack.esm
ClassicPack.esm
CaravanPack.esm
YUP - Base Game + All DLC.esm
SurvivalCore.esm
oHUD.esm
Functional Post Game Ending.esm
MoreMojave.esm
TLD_Travelers.esm
YUP - NPC Fixes (Base Game + All DLC).esp
Functional Post Game Ending - YUP Patch.esp
FalloutNV_lang.esp
The Mod Configuration Menu.esp
DarNifiedUINV.esp
Delay DLC - DM + HH + OWB + LR + GRA.esp
DLC Weapon Integration.esp
hz_1 by 1 Reload Fix.esp
OWBSinkVendorFix.esp
QuickHacking-NV-FullXP.esp
MainStoryAlterations.esp
Oven Cooking.esp
AmmoChecking.esp
WMIMNV.esp
outsidebets.esp
Uncut Wasteland.esp
Functional Post Game Ending - Uncut Wasteland Patch.esp
Functional Post Game Ending - Outside Bets Patch.esp
CNR_Beta.esp
JSawyer Ultimate.esp
JSawyer Ultimate - GRA Merged.esp
RWD-NV v1.4 [No Limbs Explosions].esp
Diagonal movement.esp
NPCs Can Miss.esp
MiscItemIconsNV.esp
kochandbohr.esp
JustModsAssorted.esp
LiveDismember.esp
ArmedToTheTeeth-NewVegas.esp
TMCOTT - Restored.esp
Factions Reloaded Legion.esp
IncreasedLegion1_1.esp
Primm Legion.esp
Legion Quests Expanded.esp
LQE-OutsideBets.esp
LQE-CNR.esp
rotfacetoriches.esp
MeleeCleave.esp
JIP Improved Recipe Menu.esp
Take Chems Make Fiends.esp
Better Game Performance.esp
Zan_AutoPurge_SmartAgro_NV.esp
Performance Of The Gods.esp
Clean-Deluxe FNV.esp
Clean-QuickSave.esp
LightsOutV2.esp
LilFixes.esp
MWCC [Standard].esp
NV_IFR.esp
NVAL - New Vegas AntiLag v3.1.esp
Occlusion.esp
Ultimate Invisible Wall Remover.esp

NVSE Plugins I'm using:
Heap Replacer
Enhanced Camera
New Vegas Tick Fix
UIO
Mod Limit Fix
NVAC
Johnny Guitar NVSE
jip_nvse
CDDA
BookMenuRestored
Stewie's Tweaks
MCM
DisableProcessWindowsGhosting

I hope you guys can help, another thing to note is that I'm not really good at solving conflicts but at the same time, everything worked fine so far, so I'm really dumbstruck as to why I'm missing meshes all of a sudden. Perhaps it was related to booting up the game's launcher that changed some things? (didn't go in-game with it, though, only changed settings, I also told Steam to upload my local files which were newer to the cloud).

EDIT: And yes, I just realized as I posted this thread that I could of just went into FOMM and changed graphics settings from there. Oh well.