I have an Idea for an addon if its even possible or hasn't already been made. I have a toon that has two gathering professions and its a real pian to switch between the two different mini map search nodes, maybe its possible to make a addon that will allow two different gathing nodes to show up on your mini map at the same time. I was looking for an addon like this and didn't find one so I'm assuming its not out there, but I've been wrong before. If anyone has seen this or has any suggestions please hit me up.

Unfortunately it is not possible to have two tracking types active at the same time. You can set up a macro to switch between two or more rtacking types but you will keep having to hit the key to switch. That's what I do.

Or just use Gatherer or a similar addon and record nodes as you go. Then you will be able to see them on your map all the time.

True you will be able to see "possible" node locations but not actual populated nodes. You may spend a lot of time running to a location on your minimap that has no vein or herb. A combination of Gatherer and a good gathering macro is your best choice.